Often your graphics software will already have the necessary tools for this effect:
- Perspective transformation
- Depth of field blur
For me good results can be achieved with the G'MIC tools that can be used in an online version, standalone, or as a plugin for Gimp.
From the online version upload any source image (here I used a screenshot of the Wikipedia article on Stack Exchange).
Filter > Deformations > Perspective
Filter > Degradation > Blur [depth-of-field]
Play with the settings rulers to achieve desired effect strength.
Below I added a canvas effect and ripple transformation with rather exaggerated values for illustration: